The best way to upload images is by converting the file into a pdf or as a powerpoint. If you are authoring content, here are the steps you can take to insert the images into the WYSIWYG!
Step 1: Select the "image: icon on the WYSIWYG
Step 2: Go to the image you are trying to use and copy the URL link
Step 3: Paste the link into the image box
Step 4: Select "save" and you will see the image pull into the content.
If you have any questions, please contact: firstname.lastname@example.org